1. Sequence disorder-induced first order phase transition in confined polyelectrolytesV. Stepanyan, Artem Badasyan, V. Morozov, Yevgeni S. Mamasakhlisov, Rudolf Podgornik, 2024, original scientific article Abstract: We consider a statistical mechanical model of a generic flexible polyelectrolyte, comprised of identically charged monomers with long-range electrostatic interactions and short-range interactions quantified by a disorder field along the polymer contour sequence, which is randomly quenched. The free energy and the monomer density profile of the system for no electrolyte screening are calculated in the case of a system composed of two infinite planar bounding surfaces with an intervening oppositely charged polyelectrolyte chain. We show that the effect of the contour sequence disorder, mediated by short-range interactions, leads to an enhanced localization of the polyelectrolyte chain and a first order phase transition at a critical value of the inter-surface spacing. This phase transition results in an abrupt change of the pressure from negative to positive values, effectively eliminating polyelectrolyte mediated bridging attraction.
Keywords: polyelectrolyte, Anderson localization, Poisson-Boltzmann equation, phase transitions, electrostatics, polyelectrolytes, Edwards equation, nonlinear schrodinger equation, nucleic acids
Published in RUNG: 04.10.2024; Views: 1114; Downloads: 2
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4. Modelling DNA adsorption on CNTArtem Badasyan, Yevgeni S. Mamasakhlisov, 2020, published scientific conference contribution abstract Abstract: Due to the attraction between the polycyclic aromatic surface elements of carbon nanotubes (CNT)
and the aromatic nucleotides of deoxyribonucleic acid (DNA) a reversible adsorption (physisorption)
between them takes place. A large number of technologies are based on DNA-CNT hybrids [1], and
thus require the theoretical support. Modelling this phenomenon in terms of Statistical Mechanics
became recently possible, thanks to the Hamiltonian formulation of the zipper model [2].
Keywords: DNA, CNT, physisorption
Published in RUNG: 22.09.2020; Views: 3651; Downloads: 0
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6. Statistical mechanics of DNA adsorption on a carbon nanotubeSh. A. Tonoyan, Davit Khechoyan, Yevgeni S. Mamasakhlisov, Artem Badasyan, 2020, published scientific conference contribution abstract Abstract: The attraction between the polycyclic aromatic surface elements of carbon nanotubes (CNT) and the aro-
matic nucleotides of deoxyribonucleic acid (DNA) leads to reversible adsorption (physisorption) between
them. With the goal to provide the theoretical support to numerous technologies on the basis of DNA-CNT
hybrids, we propose a Hamiltonian formulation for the zipper model that accounts for relevant interactions
and allows for the processing of experimental data, which has awaited an available theory for a decade.
Keywords: DNA, CNT
Published in RUNG: 22.05.2020; Views: 4234; Downloads: 109
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